Dell support sent me two new Toshiba drives for replacement. I installed them in RAID 1, as before about a week ago and applied my image. The system has run fine since. I just received 10 Toshiba drives for my 5 remaining systems.
One note: during my time of trouble shooting, I called Seagate tech support, the tech mentioned that this particular drive was not supported in any RAID configuration. I explained the systems were purchased from Dell with the RAID configuration. He said he could not support me as the drives now have OEM firmware on them. Kind of frustrating, but hopefully these posts help all that are reading.